From 978defee11a5d54f8f546e79867d2aab1b50606b Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (VMware)" <rostedt@goodmis.org> Date: Wed, 1 Aug 2018 16:06:02 -0400 Subject: [PATCH] tracing: Do a WARN_ON() if start_thread() in hwlat is called when thread exists The start function of the hwlat tracer should never be called when the hwlat thread already exists. If it is called, do a WARN_ON(). Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- kernel/trace/trace_hwlat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index 2d9d36dd5fe7..688e48be7bb5 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -354,7 +354,7 @@ static int start_kthread(struct trace_array *tr) struct task_struct *kthread; int next_cpu; - if (hwlat_kthread) + if (WARN_ON(hwlat_kthread)) return 0; /* Just pick the first CPU on first iteration */ -- 2.42.0